Question

我有一个LinearLayout，其可见性默认设置为“Gone”，我需要获取此视图的高度，以便在可见时执行滑出动画。我如何获得可见状态的总高度，因为未调用布局时，View.getHeight返回零。

<LinearLayout
    android:id="@+id/card_checkin_layout_termsconditionsconfirmation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="4dp"
    android:layout_marginRight="4dp"
    android:gravity="center_horizontal"
    android:background="#d0d0d0"
    android:visibility="invisible"
    android:orientation="vertical" >

    <Button
        android:id="@+id/card_checkin_button_confirmdetails"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:background="@drawable/shape_checkin_buttons2"
        android:text=">   Confirm your details"
        android:paddingLeft="8dp"            
        android:gravity="left|center_vertical"
        android:textColor="@color/card_checkin_button_textcolor_blue" 
        />

    <Button
        android:id="@+id/card_checkin_button_termsandconditions"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        android:paddingLeft="8dp"            
        android:background="@drawable/shape_checkin_buttons2"
        android:text=">   Terms and Conditions"
        android:gravity="left|center_vertical"
        android:textColor="@color/card_checkin_button_textcolor_blue" 
        />

</LinearLayout>

Answer 1

最初将视图的可见性设置为可见或不可见，以便计算高度。后来改变了可见度。

仅供参考：自API级别16以来，我们已弃用removeGlobalOnLayoutListener()，它已被removeOnGlobalLayoutListener()取代。

你可以试试这个：

// onCreate or onResume or onStart ...
mView = findViewByID(R.id.someID);
mView.getViewTreeObserver().addOnGlobalLayoutListener( 
    new OnGlobalLayoutListener(){

        @Override
        public void onGlobalLayout() {
            // gets called after layout has been done but before display
            // so we can get the height then hide the view    

            mHeight = mView.getHeight();  

            mView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            mView.setVisibility(View.GONE);
        }

});

getHeight for View哪个可见性=已消失

1 个答案: